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- Log ----------------------------------------------------------------- commit 4f0f1d754ff5e1e7076ebf2bf02b18fc357bc51c Author: mirabilos tg@mirbsd.org Date: Sat Jul 25 18:51:26 2015 +0200

fix inline asm changing the stack pointer leading to segfaults problem

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Summary of changes: libc/sysdeps/linux/i386/brk.c | 20 ++++++++++++-------- 1 file changed, 12 insertions(+), 8 deletions(-)

diff --git a/libc/sysdeps/linux/i386/brk.c b/libc/sysdeps/linux/i386/brk.c index c2c9327..a513886 100644 --- a/libc/sysdeps/linux/i386/brk.c +++ b/libc/sysdeps/linux/i386/brk.c @@ -1,6 +1,7 @@ /* brk system call for Linux/i386. Copyright (C) 1995, 1996, 2000 Free Software Foundation, Inc. - This file is part of the GNU C Library. + Copyright (c) 2015 mirabilos tg@mirbsd.org + This file is part of uclibc-ng, derived from the GNU C Library.

The GNU C Library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public @@ -27,15 +28,18 @@ int brk(void *addr) { void *newbrk;

- /* %ebx is used in PIC code, need to save/restore it manually. - * gcc won't do it for us if we will request it in constraints + /* + * EBC is used in PIC code, we need to save/restore it manually. + * Unfortunately, GCC won't do that for us even if we use con- + * straints, and we cannot push it either as ESP clobbers are + * silently ignored, but EDX is preserved, so it's scratch space. */ - __asm__("pushl %%ebx\n" - "movl %2, %%ebx\n" - "int $0x80\n" - "popl %%ebx\n" + __asm__("xchgl %%edx,%%ebx" + "\n int $0x80" + "\n xchgl %%edx,%%ebx" : "=a" (newbrk) - : "0" (__NR_brk), "g" (addr) + : "0" (__NR_brk), "d" (addr) + : "cc" );

__curbrk = newbrk;

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